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Rockbox mail archiveSubject: Re: Cheap/good digital-audio Boston Acoustics BA735Re: Cheap/good digital-audio Boston Acoustics BA735
From: Leslie Donaldson <donaldlf_at_lolth.aztechnologyinc.com>
Date: Fri, 5 Sep 2003 13:11:59 -0700 Well according to the page : http://www.epanorama.net/documents/audio/spdif.html there is the wire version that feeds into a 75ohm cable (think networking cables here) and a fiber version. The fiber version you could easily make a splitter the cable version could be tough. Also the S/PDIF IO is unidirectional.. from web site Characteristics Standard IEC958 "Digital audio interface" from EBU (European Broadcasting Union) details: * Audio format : linear 16 bit default, up to 24 bit expandable * Allowed sampling frequencies (Fs) of the audio: o 44.1kHz from CD o 48 kHz from DAT o 32 kHz from DSR * One way communication: from a transmitter to a receiver. * Control information: o V (validity) bit : indicates if audio sample is valid. o U (user) bit : user free coding i.e. running time song, track number. o C (channel status) bit : emphasis, sampling rate and copy permit. o P (parity) bit : error detection bit to check for good reception. * Coding format: biphase mark except the headers (preambles), for sync purposes. * Bandwidth occupation : 100kHz up to 6Mhz (no DC!) * Signal bitrate is 2.8Mhz (Fs=44.1kHz), 2Mhz (Fs=32kHz) and 3.1Mhz (Fs=48kHz). Physical connection: * Cable: 75ohm +/-5% (l<10m) or 75ohm +/-35% (l>10m) * Line driver: o Zout: 75ohm +/-20% (100kHz .. 6Mhz) o Vout: 0.4Vpp .. 0.6Vpp, <0.05Vdc (75ohm terminated) * Line receiver: o Zin: 75ohm +/-5% o Vin: 0.2Vpp .. 0.6Vpp Received on 2003-09-05 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |